/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePartyInterface.h
Clear invitations from a user because the invitations were handled by the application
true if task was started
void ClearInvitations ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & SenderId, const [FOnlinePartyId](API\Plugins\OnlineSubsystem\FOnlinePartyId) * PartyId )